How do I print an envelope?

I am Trying to print an envelope. In Page Setup, I choose Landscape orientation. The address appears OK on my monitor, but when I choose Print, the preview is Rotated & mostly Off-page.

It Prints that way too, on my Epson WorkForce 30 printer. < I say, "RUFF! :-( " >

[I use Pages v6.3 (5046), with Mac OS X v10.13. Please learn that I was _tempted_ to complain about where Pages is made, but I felt: "What is the Use in-that?"

Please help me, if you can. Thank you. :-) ]